Question

B)4×-10 =2×+2
C)2×+1=4×-7
D)3×-2=4×+9
E)5×+4=3×-2×+4
F)×+×-4=17-2×+1
G)3,4×-2,6=×-0,92
H)0,1×+3×+0,9×=14×2×

Answer 1

Explicação passo-a-passo:

B)4×-10 =2×+2

4×-2×=2+10

2×=12

×=12÷2

×=6

C)2×+1=4×-7

2×-4×=-7-1

-2×=-8

(.-1)-2×=-8 (.-1)

2×=8

×=8÷2

×=4

D)3×-2=4×+9

3×-4×=9+2

-×=11

(.-1)-×=11 (.-1)

×=-11

E)5×+4=3×-2×+4

5×-3×+2×=4-4

4×=0

×=0÷4

×=0

F)×+×-4=17-2×+1

2×+2×=14+1+4

4×=19

×=19÷4

×=4,75 ou 19/4

G)3,4×-2,6=×-0,92

3,4×-×=-0,92+2,6

2,4×=1,68

×=1,68÷2,4

×=0,7

H)0,1×+3×+0,9×=14×.2×

4×=28×

4×-28×=0

-24×=0

(.-1)-24×=0 (.-1)

24×=0

×=0÷24

×=0